Electric precipitator



1,451,418 E. P. DILLON ET AL ELECTRIC PREGIPITATOR Filed June 15, 1922 ,2 she`ets-sheet l @yl j JZ GasOn/f/ef I I l I Il I 1 I I |l l l l l `I 1 Il I 'I I Il l I Il l z :I l l| Il I' 'I I I ,I l: r I l :l l l g :I I Il Il I h I I Fi' Tl l I g I I l I l l I I I I l l I l l I l l I I l l l I I I l I I. l l .sierva/fel' Patented Alpi.r 1o, 1923.

UNITED `s'rAr'lazs EDWARD P: D'IEEoN AND ALBERT A. HEIMROD, 0E NEW YORK, N. Y., AssIGNoRs To i RESEARCH CORPORATION, oF NEW YORK, N. Y., A CoRPoRATIoN or NEW-YORK.

e i ELECTRIC PRECIVPITATCR.

Application led J'une 15,

To all whom it may concern.'

Be it known that we, (1) EDWARD P. D111- -LoN and (2) ALBERT A. HEIMROD, citizens of the United States, residing at (l) 86() Riverside Drive, New York, (2) 867 West 181st the following is a specification.

This invention relates to electric precipitators and more articularly to an apparatus fof the type refsrred to which is adapted for the separation from gases of viscous or semi-viscous material or, in general, of mavterial which has atendency to firmly adhere to the collecting electrodes.

As is well-known, the presence of tar or other similar material in gases presents a 20 dilicult/ problem for the application of electric precipitators because the particles precipitated o ut of the gas stream against the surface of the collecting electrode stickwith considerable tenacity and cannot be removed by ordinary means such as rapping or jarringmechanism.` I

In the past various arrangements have been proposed for forcibly removing the tar by means of Scrapers. Most of such arrangements, however, have been either compl-icated in construction or operation or both, or have been inefficient.

It is the general object of the invention to provide an electric precipitator, simple in construction and operation, containing simple means for removing the viscous deposit Jfrom the collecting electrodes.

It is a particular object to provide an electric precipitator containing simple means for automatically and continuously cleaning the collecting electrodes during the normal operation.

For a full understanding of the invention,

4 its principles of operation and the advancompanying drawings in whichlFig. 1 is a side elevationpartly in section of y an embodiment of theinvention;

Fig. 2 is a section taken. at right angle to Fig. 1.

Fig. 3 is a'section similar to Fig. 2 of a modified form of the invention; and

Fig. 4 is a fragmentary sectional view taken on line 4;-4, Fig. 3; and

tages derived, reference is madeto the ac- 19'22. serial 110.568.571.

Fig. 5 is a fragmentary view on a larger. scale of a detail.

In' Figs. 1 and 2, 10 represents a precipitator casing having -the gas inlet 11 and the outlet 12. For the sake'of example the casing contains three tubes or pipes 13 mounted at their upper ends in the bottom 14 of the outlet mani-fold 15. .Upon insulators 16 is supported a bar 17 from which aresuspended the discharge electrodes 35.

' The arrangement of the tubes 13 which are the collecting electrodes and the dis- `charge electrodes 35 represents one well.

known arrangement of the prior art and does not constitute a `part of tlie specitic novelty. Below the tubes 13 are mounted tubes 18 the external diameter of which is substantially equal to the internal diameter of'tubes 13. vThe upper edge of the tube 18 is formed to provide a cutting or scraping edge 18a.

The tubes 18 are supported upon endless chains 19and 20 driven by sprocket wheels 21, 21a and 22, 22a. All sprocket wheels 21, 21a, 22 and 22a are mounted upon common shafts 23, 24, 25 and 26respectively, which may be operated by a crank 27 or inv any other suitable manner. Y

Byturning the crank 27 the tubes 18 may be raised` to scrape the collecting electrodes 13, The tubes 18 and the chains 19 and 20 are of course so dimensioned that the tubes 13 can be scraped throughout their lengths.

Below thepipes 13 are mounted in series pipe sections 28 co-extensive with the length of the' tubes 18 when they are in their lowest position. The pipe sections 28 form part of a circulating system for steam or other suitable heating medium.

The operation is obvious: The pipes 18 in their upward movement scrape the desitfrom the pipes 13 and during the gwnward movement come under the thermal effect of the heated pipe sections -28 with the result thatfthetar is'suiciently rsoftened to flow outlof the pipes 18. The speed of the chains 19 and 20. may of course be adjusted to suit particular requirements.

The steam -coils have been specifically referred-temerely -as a convenient means for applying heat to Athe sections 18. It `is understood that within the scope of the invention many arrangements are applicable, inside or outside pipes 1,8, for imparting.

heat to the tar or other material scraped from pipes 13.

nsome cases it maybe more advantageous to provide a mechanical cleaner for the tubes 18. As indicated in Fig. 3 a station- `ary/,scraper 30 may be mountedy upon a rod 31 extending upwardly into tube 32. `The scraper 30 is preferably disposed adjacent to the lower end of tube 33. During the upward movement of the tube 32 the deposit is removed from the tube 33 and duringthe downward movement of tube32 the scraper 30 removes the material from the'tube 32.

The scraper 30 may beany centrally per- "form and the characteristics of the scraping edge of the tubes 18 and 32. 1t is furthermore'understood that the scraper 30 and its mode of operation may be materially changed within the scope of the invent-ion. I The principal advantage of a device of the character described lies 1n the simplicity of ing the other the construction operating while the precipi t'ator' is in operation. may be made of thin material whereby no material difference is introduced between the tube 13and the tube 18. 'Both tubes, in fact, function as collecting electrodes under substantially the same conditions. y

We claimi 1. The combination with a stationary tubular body constituting a collecting electrode and a discharge electrode therein, of a. tubular memberhaving a sliding fit in the tubular body and provided at one end withV means defining a scraper edge and means engaging the other end of the tubular member for reciprocating the same. Y

2.. .The combination with a stationary ltubular body constituting a collecting electrode and a. dischargeelectrode therein, of a thin-walled tubular member Ihaving a sliding fit in the tubular body and having a scraper edge at one end,and means engagend of the' tubular member for reciprocating lthe same, the tubular body and the tubular member having substantially the same length'. l i' The scraping tubes tionary.

3. The combination with a tubular collectingelectrode and aA dischar electrode, of a tubular member having a sil collecting electrode, means at one end of the tubular memberl defining a scraper edge, meansfor reciprocating the tubular member and means for heating the tubular member.

4. Apparatus according to claim 3 in which the heating means is stationary and disposed adjacent the path of motion of the tubular element remote from the collecting electrode.

5. Apparatus according .to 'claim 4- in Awhich the heating means is disposed within the compass of the tubular member.

6. The combination with a tubular collecting electrode and a discharge electrode, of ai tubular member having a sliding fit in the collecting electrode, means at one end of the tubular member defining a scraper edge,

means for reciprocating the tubular member and means for scraping the lnner surface of the tubular member.y

iding lit in the 7. Apparatus according to claim ,Ghinwhich the scraping means is constructed and arranged to scrape the tubular member while the latter is movingrelatively to the collecting electrode.

\ 8. Apparatus according to claim 6 inA which the scraping means is axially sta.-

9. Apparatus according` to claim 8 'i iii which the scraping means is a disk-like element supported upon an axially extending rod.

10. The combination with a tubular collecting electrode and a rigid discharge electrode extending into the same substantially to the end thereof, of a tubular member having a sliding itin the collecting electrode and having a scraper edge at the end facing toward the support for the discharge electrode, and means engaging the other end of the tubular member for reciprocating the same.

' 11.' Apparatus accord'ng toj claim l0 including means'remote rom the collecting electrode for heating the tubular member.

12. .Apparatus according to claim 11 in which the heating means is stationary and disposed in proximit to the path described by the tubular member.

testimony whereof, we affix our signatures. f

EDVARD P. DILLON.

` 1: ERT A. HEIBROD. 

